Revert of [heap] Add a guard for restarting the memory reducer after mark-compact.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 064e3f36919ff51045b630367d463a9dfc9f5a86..9941cd9a9b182d361cbf7ef9e5d29ba8cd8e6878 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1017,7 +1017,6 @@ bool Heap::CollectGarbage(GarbageCollector collector,
           (committed_memory_before - committed_memory_after) > MB ||
           HasHighFragmentation(used_memory_after, committed_memory_after) ||
           (detached_contexts()->length() > 0);
-      event.committed_memory = committed_memory_after;
       if (deserialization_complete_) {
         memory_reducer_->NotifyMarkCompact(event);
       }